Latest Contributions by JohnSobetzer

If you run a dissolve and have a check in the create multiparts features box does that work? ... View more

Go to the sid's Layer Properties - Symbology  and check Display Background Value and in the drop down select  No Color.  I think it likely that the 0,0,0 setting will work but if not repeat with 255,255,255.  You can also try setting No Data to No Color. You may not get a perfectly clean result even after doing this because the sid compression can introduce some data into formerly no data areas, but most of them should be gone.  If these are still unacceptable you will have to clip to another image format like a tif which might make for some large files. ... View more

See #NIM059032.  I don't know if anything will be done regarding it. ... View more

To the extent that the gaps and overlaps are less than a suitable tolerance you could run an Integrate.  But I'm guessing that won't handle most of your problems.  You could run something akin to a clean which would get rid of the problems under the tolerance limit and then create new polys in the gaps and new ones to replace the overlaps.  You could then run an Eliminate to get rid of many of these.  But like any automated process you might not like the results, although by fiddling around with the settings you might get a lot of work done. The advantage of the topology is that it identifies the errors and lets you manually fix each one the way you want it to be. As for a clean, if you have ArcInfo, you could convert to a coverage and run a clean.  Of you could in effect do the same by converting your polygons to lines and points, and then creating polygons from the lines with the points providing the attributes.  If you don't have ArcInfo but have ETGeowizards full version you could run a clean using it.  That has the option to create a point layer showing all overlaps. ... View more

That looks like a good workaround for your situation, Elliot, about as good as you could get.  If I had to use 10 I'd probably try it.  But like the workarounds I've tried with the DDP such as using a table to pan around to different pages, it can't fix all the problems even skipping the initial setup work.  You certainly wouldn't want to open up any other tables in that project because in 10 (unlike 9x) they would all open up in that narrow window.  It also requires dropping the mouse and typing in a number for a single page, or more for multiple pages, and if the latter it doesn't persist.  Now if in SP1 they allowed tables to appear in their own window, and in the DDP allowed the use of an index table set up like yours with just clicking in it to move the map to different pages or export one or more, then I'd like that. ... View more

Matt: Here's something that might make the process easier.  If the pdf has layers in it, you can limit which ones display in the pdf at any time, and save that as a jpg and only those layers will be in it.  This can reduce your clutter considerably when using ArcScan.  If you have a lot of layers you might even turn on different layers and save to jpg for use in Arcscan. In addition if you have a color pdf you can convert it to grayscale, then save it as a pdf, then when you open it in ArcMap you can use the classify option and limit it to 2 classes, and then make the "white" one no color. I would have thought that by now there would have been readily available software to convert the individual vector layers of a pdf to a vector usable in other programs, potentially even georeferenced vectors, but I can't find any.  I saw suggestions of creating eps or wmf files (you could use Adobe Pro, Inkscape) and then opening them in ACD (formerly Denebas) Canvas, but I don't have the latter.  Maybe some other user has more information on doing this. ... View more

It depends on how you created your 3 layers.  If in the original you selected one hazard group and exported it to a new dataset, then it should only hold those records.  Same for the other two.  Then they shouldn't each display all the locations. If you instead added your original in 3 times, and then used a definition query to limit each layer to a specific hazard group, then that should work too, as long as you keep the definition query and the underlying field being defined stays the same. If you used the Create Layer from Selected Features, and used it three times with different selections to create three different hazard layers, that should work, but every once in awhile something causes it to fail, and the selection is lost and it displays all the records. Having said all this, I am continually amazed sometimes by how often ArcMap seems to cache information in some unknown location, and refuse to update the display.  I've had to close projects and reopen them, and sometimes that fails and I have to copy and then remove the layer, close the project and reopen it, and then paste the layer, and most recently I had to do this without using copy and paste to do this, but add it fresh and re symbolize, define, etc. it.  Crazy. ... View more

You might check out the NAIP photography.  In 2008 they may have produced 4 band imagery.  If so you just remap the RGB bands from their usual 1, 2, 3 to 4,2,1 and you have color IR.  You could check the MN state GIS site to see if any are available, or go to the US Data Gateway site for county wide mosaics. ... View more

You might submit an enhancement request and in the process find out if there are any plans in place.  LizardTech has released the SDK for it. ... View more

You might search on or locate the Build Raster Attribute Table tool and see if the table gives you the information you need? ... View more

I've used Hawth's Analysis Tools (free) to produce points at line intersections in the same layer, but I think it creates duplicates at each location which I removed by running a clean.  That was many years ago.  ETGeowizards has a Renode Wizard that from the help says it would analyze a line layer and it could create points representing the regular nodes where two lines intersect but it isn't one of the free tools. ... View more

Go to www.lizardtech.com if you want software that can: 1) compress original imagery to the sid or jp2 format, 2) (for less money) crop, mosaic, or otherwise manipulate imagery that is already in the sid or jp2 format and keep it in those formats, or 3) (free software) clip and save sid or jp2 in other formats such as geotiff.  They are GeoExpress (priced by the amount of imagery you want to be able to compress), GeoExpress Tools (around $1500) and GeoViewer (free).  Older versions of ArcGIS came with the ability to compress to sid but only for images under 50MB or so which is not a file size but a kind of pixel count.  Given the price you may want to rely on ArcMap's ability to project on the fly, or if you really need a reprojected raster, using the jp2 option in ArcGIS, which is free.  Jp2 (jpeg2000), sid and ecw are all wavelet compression rasters, but the latter two are proprietary. ... View more

Lisa, I think you have two different issues.  One is the visual aspect.  I think ArcMap lets you zoom in past 1:1 but in my experience beyond that what you see is not what you get.  The other is the topological/snapping aspect.  If you are attempting to move a vertice of one polygon to snap to a line of an abutting polygon with the idea of having their edges be perfect coincident, there may be a problem because of the precision.  That vertice has to "snap" to some underlying grid and that point may not be "on" the line.  I think to have perfectly coincident shared boundaries in shapefiles and feature classes you have to have vertices in the same place. Having said that the difference is probably so small you wouldn't notice it, and you probably can't see it due to the visual limitations.  And even if you could, as one of my coworkers said, you can fix errors or you can make your lines thicker and/or change your scale. If you create a topology and verify it I think a matching vertice will be added along the line of the abutting polygon.  Or you could clean your layer after editing.  Introducing a vertice along a line by either approach may cause it to "jump" in comparison to the backup dataset without that vertice, however. Or you could convert your polygons to lines and points, clean the lines, and from then on edit them and build polygons using the lines and points, the points providing the attributes.  Then a single line is used as the boundary for abutting polygons much like a coverage works. ... View more

ArcGIS 10 has had issues with ecw file formats so maybe this is another.  Having said that, a 5GB ecw, sid or jp2 at typical 1:20 compression, is a huge file, and probably has to be decompressed to the full 20 GB size before it can be processed.  That may just be too much for the computer and/or software.  If you can get it to display in a project, you might: 1) use a clip option in the data frame properties to limit its display, 2) create a masking polygon that you place over it in the TOC to limit its display, 3) export directly to a preferred file format with georeferencing from the view, perhaps in smaller pieces that can be mosaiced, to provide enough resolution, or 4) export from a layout to a preferred raster format and then georeference that. You might also try other programs like the LizardTech Geoviewer (free) and see if it can save to a different format. ... View more

You might report that to ESRI tech support.  Someone at ESRI might monitor this thread but it is always better if a user reports an issue and gets a determination of a bug, if you ever want it fixed. ... View more